A level

сокращение от Advanced Level

Большой англо-русский словарь

A level

noun 1. the second of three standardized British examinations in a secondary school subject used as a qualification for university entrance; also successful completion of an A-level examination in a particular subject — called also Advanced level — compare O level, S level 2. a. the level of education required to pass an A-level examination b. a course leading to an A-level examination

Merriam-Webster's Collegiate Dictionary